<template>
	<div>
		<!-- 面包屑导航 B -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
			<el-breadcrumb-item>商品参数</el-breadcrumb-item>
			<el-breadcrumb-item>参数列表</el-breadcrumb-item>
		</el-breadcrumb>
		<!-- 面包屑导航 E -->

		<!-- 卡片视图区 B -->
		<el-card>
			<!-- 警告区 B -->
			<el-alert
				show-icon
			    title="注意:只允许为第三级分类设置相关参数!"
			    type="warning"
				:closable="false">
			</el-alert>
			<!-- 警告区 E -->

			<!-- 选择商品分类区 B -->
			<el-row class="cat_opt">
				<el-col>
					<span>选择商品分类:</span>
					<!-- 选择商品分类的级联选择框 -->
					<el-casader
					expand-trigger="hover"
					:otpions="catelist"
					:props="cateProps"
					v-model="selectedCateKeys"
					@change="handleChange"></el-casader>
				</el-col>
			</el-row>
			<!-- 选择商品分类区 E -->

			<!-- tab 页签区域 B -->
			<template>
			  <el-tabs v-model="activeName" @tab-click="handleTabeClick">
				<!-- 添加动态参数的面板 B -->
			    <el-tab-pane label="动态参数" name="many">
					<!-- 添加参数的按钮 -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
					<!-- 动态参数的表格 B -->
					<el-table :data="manyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<template slot-scopt="scope">
								<!-- 循环渲染 tag 标签 -->
								<el-tag v-for="(item,i) in scope.row.attr_valus" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
								<!-- 输入的文本框 -->
								<el-input
								  class="input-new-tag"
								  v-if="scope.row.inputVisible"
								  v-model="scope.row.inputValue"
								  ref="saveTagInput"
								  size="small"
								  @keyup.enter.native="handleInputConfirm(scope.row)"
								  @blur="handleInputConfirm(scope.row)"
								>
								</el-input>
								<!-- 添加按钮 -->
								<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
							</template>
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="参数名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button type="primary" icon="el-icon-edit" circle size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button type="primary" icon="el-icon-delete" circle size="mini"  @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
					<!-- 动态参数的表格 E -->
				</el-tab-pane>
				<!-- 添加动态参数的面板 E -->

				<!-- 添加静态属性的面板 B -->
			    <el-tab-pane label="静态属性" name="only">
					<!-- 添加静态属性的按钮 B -->
					<el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
					<!-- 添加静态属性的按钮 E -->

					<!-- 静态属性的表格 B -->
					<el-table :data="onlyTableData" border stripe>
						<!-- 展开行 -->
						<el-table-column type="expand">
							<!-- 静态属性的表格 B -->
							<el-table :data="manyTableData" border stripe>
								<!-- 展开行 -->
								<el-table-column type="expand">
									<template slot-scopt="scope">
										<!-- 循环渲染 tag 标签 -->
										<el-tag v-for="(item,i) in scope.row.attr_valus" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
										<!-- 输入的文本框 -->
										<el-input
										  class="input-new-tag"
										  v-if="scope.row.inputVisible"
										  v-model="scope.row.inputValue"
										  ref="saveTagInput"
										  size="small"
										  @keyup.enter.native="handleInputConfirm(scope.row)"
										  @blur="handleInputConfirm(scope.row)"
										>
										</el-input>
										<!-- 添加按钮 -->
										<el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
									</template>
								</el-table-column>
								<!-- 索引列 -->
								<el-table-column type="index"></el-table-column>
								<el-table-column label="参数名称" prop="attr_name"></el-table-column>
								<el-table-column label="操作">
									<template slot-scope="scope">
										<el-button type="primary" icon="el-icon-edit" circle size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
										<el-button type="primary" icon="el-icon-delete" circle size="mini"  @click="removeParams(scope.row.attr_id)">删除</el-button>
									</template>
								</el-table-column>
							</el-table>
							<!-- 静态属性的表格 E -->
						</el-table-column>
						<!-- 索引列 -->
						<el-table-column type="index"></el-table-column>
						<el-table-column label="属性名称" prop="attr_name"></el-table-column>
						<el-table-column label="操作">
							<template slot-scope="scope">
								<el-button type="primary" icon="el-icon-edit" circle size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
								<el-button type="primary" icon="el-icon-delete" circle size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
							</template>
						</el-table-column>
					</el-table>
					<!-- 静态属性的表格 E -->
				</el-tab-pane>
				<!-- 添加静态参数的面板 E -->
			  </el-tabs>
			</template>
			<!-- tab 页签区域 E -->

			<!-- 选择商品分类区 E -->
		</el-card>
		<!-- 卡片试图区 E -->

		<!-- 添加参数的对话框 B -->
		<el-dialog
		  :title=" '添加' + titleText "
		  :visible.sync="addDialogVisible"
		  width="50%"
		  @close="addDialogVisibleClosed">
		  <!-- 添加参数的对话框 -->
		  <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
		    <el-form-item :label=" 'titleText' " prop="attr_name">
		      <el-input v-model="addFrom.attr_name"></el-input>
		    </el-form-item>
		  </el-form>
		  <span slot="footer" class="dialog-footer">
		    <el-button @click="addDialogVisible = false">取 消</el-button>
		    <el-button type="primary" @click="addParams">确 定</el-button>
		  </span>
		</el-dialog>
		<!-- 添加参数的对话框 E -->

		<!-- 修改参数的对话框 B -->
		<el-dialog
		  :title=" '修改' + titleText "
		  :visible.sync="editDialogVisible"
		  width="50%"
		  @close="editDialogVisibleClosed">
		  <!-- 添加参数的对话框 -->
		  <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
		    <el-form-item :label=" 'titleText' " prop="attr_name">
		      <el-input v-model="editFrom.attr_name"></el-input>
		    </el-form-item>
		  </el-form>
		  <span slot="footer" class="dialog-footer">
		    <el-button @click="editDialogVisible = false">取 消</el-button>
		    <el-button type="primary" @click="editParams">确 定</el-button>
		  </span>
		</el-dialog>
		<!-- 修改参数的对话框 E -->

	</div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 级联选择框双向绑定到的数据
      selectedCateKeys: [],
      // 被激活的页签的名称
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制添加对话框的显示与隐藏
      addDialogVisible: false,
      // 添加参数的表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单的验证规则对象
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      },
      // 修改对话框的显示与隐藏
      editDialogVisible: fasle,
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' }
        ]
      }
      // // 控制按钮与文本框的切换显示
      // inputVisible: false,
      // // 文本框中输入内容
      // inputValue: ''

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    getCateList() {
      const { data: res } = this.get('categories')
      console.log(res)
      if (res.meta.status !== 200) return this.$message.error('获取信息失败!')
      this.$message.success('获取信息成功!')
      this.catelist = res.data
      this.total = res.data.total
    },
    // 级联选择框选中项变化, 会触发这个函数
    handleChange() {
      this.getParamsData()
    },
    // tab 页签点击事件的处理函数
    handleTabeClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    // 获取参数的列表数据
    async getParamsData() {
      // 如果 this.selectedCateKeys.length !== 3 证明选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 否则证明选中的是三级分类
      console.log(this.selectedCateKeys)
      // 根据所选分类的 Id, 和当前所处的面板,获取对应的参数
      const { data: res } = await this.$http.get('categories/{this.cateId}/attributes', { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数列表失败!')
      }
      console.log(res.data)

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals
          ? item.attr_vals = item.attr_vals.split(' ') : [],
        // 控制文本框的显示与隐藏
        item.inputVisible = false
        // 文本框输入的值
        intem.inputValue = ''
      })
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听添加对话框的关闭事件
    addDialogVisibleClosed() {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮,添加参数
    async addParams() {
      const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
        attr_name: this.addForm.attr_name,
        attr_sel: this.activeName
      })
      if (this.meta.status !== 201) {
        return this.$message.error('添加参数失败!')
      }
      this.$message.success('添加参数成功!')
      this.addDialogVisible = false
      this.getParamsData()
    },
    // 点击按钮,展示修改的对话框
    async showEditDialog(attr_id) {
      // 展示出修改对话框
      this.editDialogVisible = true
      // 查询当前参数的信息
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
        {
          params: {
            attr_sel: this.activeName
          }
        }
      )
      if (this.meta.status !== 200) {
        return this.$message.error('获取参数信息失败!')
      }
      this.editForm = res.data
    },
    // 监听修改对话框的关闭事件
    editDialogVisibleClosed() {
      this.$refs.editFormRef.resetFiled()
    },
    // 点击按钮, 修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
          attr_name: this.editForm.attr_name,
          attr_sel: this.activeName
        })
        if (this.meta.status !== 200) return this.$message.error('修改参数失败!')
        this.$message.success('获取参数成功!')
        this.getParamsData()
        this.editDialogVisible = false
      })
    },
    // 根据 id 删除对应的参数项
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除改参数, 是否继续?', '提示', {
				          confirmButtonText: '确定',
				          cancelButtonText: '取消',
				          type: 'warning'
				        }).catch(err => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('已取消删除!')
      }
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
      if (this.meta.status !== 200) {
        return this.$message.error('删除参数失败!')
      }
      this.$message.success('删除参数成功!')
    },
    // 文本框失去焦点, 或按下了 Enter 都会触发
    async handleInputConfirm(row) {
      if (row.inputVisible.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      // 如果没有 return 证明输入了内容, 需要做后续处理
      row.inputValue.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      // 需要发起请求保存到数据库
      // const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
      // 	attr_name: row.attr_name,
      // 	attr_sel: row.attr_sel,
      // 	attr_vals: row.attr_vals.join(' ')
      // })
      // if(res.meta.status !== 200) {
      // 	return this.$message.error('修改失败!')
      // }
      // this.$message.success('修改成功!')

      // 将上面的代码替换为下面的代码, 因为 saveAttrVals() 里面写的就是上面的代码
      this.saveAttrVals(row)
    },
    // 点击按钮, 展示文本输入框
    showInput(row) {
      // 将布尔值改变成 true 后, 页面上的元素还没又被渲染, 我们还需要等一个时机, 就是 this.$nextTick() 的调用, 就证明页面上的元素被重新渲染了
      row.inputVisible = true
      // 让文本框自动获取焦点
      // $nextTick 方法的作用,就是当页面傻瓜元素被重新渲染之后,才会指定回调函数中的代码
      this.$nextTick(_ => {
				    this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将 attr_vals 的操作保存到数据库
    async saveAttrVals(row) {
      // 需要发起请求保存到数据库
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
        attr_name: row.attr_name,
        attr_sel: row.attr_sel,
        attr_vals: row.attr_vals.join(' ')
      })
      if (res.meta.status !== 200) {
        return this.$message.error('修改失败!')
      }
      this.$message.success('修改成功!')
    },
    // 删除对应的参数可选项
    handleClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    // 如果按钮需要被禁用, 则返回 true, 否则返回 false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) { return true }
      return false
    },
    // 当前选中的三级分类的 id
    cateId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    // 动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }

}
</script>

<style lang="less" scoped>
	.cat_opt{
		margin: 15px 0;
	}
	.input-new-tag{
		width: 120px;
	}
</style>
